1,Casting steel,Blade:aluminum alloy 2,Large air volume,low noise,high-speed,light ... : 7pcs dia-cast aluminum alloy,fan body and cover:galvanized steel,handle: die-cast plastics,cable length:3m motor: aluminum alloy,with America,Japan ... excellent function,light weight, novel design,special manufactured for underground cable maintainance,shipping making,exhaust for fire fighting, piping construction and ...